1El secreto
Eun Dan-oh es una estudiante adinerada que padece una enfermedad cardiaca congénita. Un día comienza a tener problemas con su memoria, después de investigar múltiples enfermedades, ella piensa que ha obtenido el don de ver el futuro.
2El mundo de los cómics
Después de descubrir que su vida forma parte de un cómic romántico, Da-oh está decidida a cambiar el rumbo de su historia. De pronto, un chico misterioso cuyo personaje no ha sido identificado aparece en escena.
3El chico misterioso
Finalmente, Dan-oh logra ver el rostro de su chico misterioso e intenta acercarse. Dan-oh deposita todas sus esperanzas en su chico para poder cambiar su destino.
4Dentro del bosque
Dan-oh se extravía en el bosque y el chico número 13 va a rescatarla. Dan-oh decide ponerle nombre de forma oficial al chico número 13, así que lo nombra Ha-ru.
5Cambiar la historia
Haru nota como su vida empieza a cambiar desde el momento en que se topo con Dan-oh. Dan-oh, después de muchos intentos, logra terminar su relación con Baek Kyung, pero él se niega a aceptar su rechazo.
6Mi propia respuesta
Debido a la ausencia de Joo-da y Nam-joo en escena, Dan-oh y Kyung se vuelven los personajes principales. Haru visita al hada del calamar para decirle que seguirá del lado de Dan-oh. Dan-oh se arregla para su primera cita.
7El rumbo de la historia
Kyung lee el libro y finalmente comprende las reglas del mundo del cómic. Dan-oh busca desesperadamente a Haru y acude con el hada del calamar por respuestas. Después de ver las consecuencias, Dan-oh acepta seguir las órdenes del escritor.
8Sin memoria
Tras comprobar que Haru perdió su memoria por completo, Dan-oh decide estar al margen y mantenerse alejada de él. Dan-oh acepta casarse con Kyung en cuanto sus padres fijen la fecha de la boda.
9El chico sin nombre
Tras tocar un misterioso hoyo negro que apareció repentinamente, Haru se hiere nuevamente la mano y recobra su memoria. Kyung sospecha que la trompeta trepadora encierra un gran secreto.
10Trompeta trepadora
Kyung descubre los pequeños pedazos del libro "Trompeta trepadora" que quemó el hada del calamar. El tiempo de Dan-oh corre contra reloj, teniendo cada vez más episodios de dolor y visitas al hospital.
11El dolor del amor
Kyung siente melancolía al recordar lo cercanos que eran Dan-oh y él de niños. En el pasado, se descubre la complicidad entre Kyung y Haru. Se celebra el aniversario de la muerte de la madre de Kyung. Una nueva estudiante llega a la secundaria.
12Cambio de escena
Haru cumple uno de los mayores sueños de Dan-oh provocando los celos de Kyung. El médico le pide a Dan-oh que se realice la cirugía de corazón lo más pronto posible. Kyung le entrega a Dan-oh el anillo de compromiso que perteneció a su madre.
13Lo que mi configuración no domina
Haru finalmente recuerda cual fue su relación con Dan-oh en el pasado. Dan-oh decide terminar su relación con Kyung y pasar sus últimos momentos con Haru. Kyung confiesa sus verdaderos sentimientos hacia Dan-oh.
14La voluntad del escritor
Gracias a la intervención de Haru, el doctor da nuevas noticias sobre la enfermedad de Dan-oh. Calamar recuerda todo sobre su pasado y su profunda herida de amor. Kyung le advierte a Haru sobre lo que le espera si decide permanecer con Dan-oh.
15Te esperaré
Haru logra averiguar lo que sucedió con Dan-oh después del hospital. Calamar le cuenta a Haru que la historia está a punto de llegar a su fin. Haru intenta que Dan-oh recuerde todo lo que vivieron juntos.
16Hallarnos de nuevo
Dan-oh se reencuentra con sus viejos amigos y recuerdos. Haru le agradece a Kyung por ayudarle a recuperar la memoria. Haru y Dan-oh logran despedirse antes de que las luces de toda la escuela se apaguen.
17Haru Is Back
Haru returns to his old self, and Dan Oh and Do Hwa are happy to have the old Haru back. Dan Oh is glad to have Haru back, but she is also afraid to lose him again. Meanwhile, Dan Oh and Haru play hooky and they find an antique shop.
18Haru’s Past Life
Haru continuously feels like something new that he has seen is already familiar to him. Kyung keeps picking a fight with Haru, and Haru doesn’t step back. Dan Oh’s condition gets worse. Meanwhile, Dried Squid realizes that Haru regained his memory back, and he worries about the future.
19Kyung’s Warning to Haru
Kyung finds the book which Dried Squid burnt, and Dried Squid tells Kyung the former work of the writer has nothing to do with their current world. Kyung is mean to Dan Oh on the stage, and he regrets it after the stage. Meanwhile, Kyung tells Haru that he can’t beat him since he is a mere extra.
20Haru & Dan Oh's Promise
Haru wants to change Dan Oh’s story. Ju Da waits for Nam Ju, but he doesn’t come. Do Hwa tells Ju Da to think about herself first, and Ju Da tells him there’s nothing she can do on her own. Meanwhile, Dan Oh and Haru make a promise to meet in front of the tree on October 10.
21Dried Squid’s Identity
Kyung is worried about Dan Oh because she just left the hospital, and he recalls his old memory with Dan Oh. Dan Oh comes back to school. Dan Oh is happy when she is with Haru, but Kyung isn’t happy to see her like that. Meanwhile, Kyung asks Dan Oh if she likes Haru because he can change the stage.
22A Transfer Student
Nam Ju leaves Seuli High School, and Ju Da tells him that he doesn’t have to worry about her. Dried Squid tells Haru that he needs to stop the person who’ s trying to change the stage even if it’s Dan Oh. Meanwhile, there’s a transfer student in Seuli High School.
23Something Seems off about Ju Da
Dried Squid tells Kyung that he lost everything because of him. Kyung sees the comic book and tells Dan Oh that she will call of their engagement. Haru tells Dan Oh that they have known each other for a long time. Meanwhile, Ju Hwa suggests Dan Oh that she should get the surgery.
24Kyung’s Proposal
Sae Mi bullies Ju Da again, but Ju Da won’t let her slide this time. Dan Oh sees the storyboard again and decides to change the stage once again. Do Hwa and Haru try hard to change the stage, but it is not easy. However, Haru succeeds in changing the stage. Kyung tells Dan Oh that they can never be apart.
25Dan Oh’s Condition Gets Worse
In “Trumpet Creeper”, Haru witnesses Dan Oh’s death. He doesn’t want to admit that the same thing is happening in “Secret”, but Dried Squid tells him that the story is repeating itself. Meanwhile, Dan Oh’s condition gets worse, and she wants to keep it secret from Haru.
26Haru Is Afraid of Losing Dan Oh
Do Hwa gets to know that Ju Da is aware of herself. Jun Hyun warns Haru to leave Kyung alone. Kyung tells Dan Oh that he’ll suffer from a wound that he’ll never recover from if she dies. Haru gets to know that Dan Oh needs surgery, and he is afraid of losing her because of that surgery.
27Dried Squid’s Past
Do Hwa and Haru try to change Dan Oh’s story. Haru goes to the hospital and switches Dan Ohs’ medical chart to another person’s. Dan Oh doesn’t need to have surgery anymore, but Kyung tells Haru that Dan Oh will die because of him. Kyung warns Haru to stop changing the story before he puts Dan Oh in bigger danger.
28Dan Oh Is Still Sick
Dried Squid warns Kyung not to meddle with him and Su Hyang in this world. Dan Oh’s story has changed, but she is still sick in the shadow. Haru gets to see the scene where he kills Dan Oh in “Trumpet Creeper”. Meanwhile, Kyung gets to know that only the self-awareness disappears when someone dies in the shadow.
29Ju Da’s Decision
Dan Oh can’t remember anything that happened in the shadow, and she is not aware of herself now. Everyone in the school gets to know that Nam Ju was born out of wedlock, and they start to ignore him. However, Ju Da stays by his side even in the shadow. Meanwhile, Su Hyang is aware of herself.
30Dan Oh Regains Her Memory
Dan Oh and Kyung promise to meet at the school to celebrate their 10th anniversary. However, Kyung tells Haru to go meet Dan Oh in place of him, and Dan Oh gets to find her memory back there. Dan Oh and Haru spend a great time together again, but Haru finds out that he has no name in his nametag.
31Reconciliation
Haru wants to do everything for Dan Oh. Do Hwa realizes that the real Dan Oh is back, and he is happy to have his friend back. Dried Squid suggests Haru and Kyung that they should all forgive each other. Meanwhile, Jun Hyun tells Haru that he is envious of his bravery to change his own fate.
32Seuli High School's 115th Graduation
Haru’s scar on his hand disappears, and he realizes that it’s time to be erased from the comic book. After Haru’s disappearance, Dan Oh still misses Haru. Even on the graduation day, Dan Oh thinks about Haru. Meanwhile, she finds a diary near the 300-year-old tree, and she finds out Haru’s drawings.