Spring Day

Eun Ho writes an e-mail to his father, Hyung Jin, and leaves to find his birth mother. At Jeju airport, Eu Ho tries to take a taxi that Jung Eun gets off in a hurry and sees a box she left. Eun Ho gets on the boat bound for Biyangdo and meets her again. Eun Ho visits Dal Ho, who knows where his mother is. Eun Ho soon finds out Jung Eun is Dal Ho's granddaughter who has lost the will to speak. Eun Ho feels empathy for Jung Eun because she is similar to him and tries to get her to speak again.

Eun Ho starts to have good feelings for Jung Eun, and she also feels good for him. Hyung Jin and Hye Rim come to the jazz bar where Eun Sub plays double bass. Eun Sub turns the car and runs away while being dragged home. Hyung Jin reports the car stolen, and Eun Sub is arrested by the police. Eun Sub is known as Dr. Crybaby at the hospital because he sheds tears whenever he sees blood. Eun Sub hates the doctor's white coat and the smell of the hospital. He feels like vomiting when he sees blood.

Jung Eun keeps shouting at Eun Ho not to leave, and Eun Ho looks at her from the boat that leaves the dock. Jin Tae, who also watches Jung Eun from the boat, drops his jaw. Jin Tae cannot believe to see Jung Eun speaks. Eun Ho leaves after telling her he will be back soon, and Jung Eun runs to the health care center.

Eun Sub is devastated by Eun Ho's accident. Eun Sub seems to hate Eun Ho but, in fact, likes him. Drunk Eun Sub comes to Eun Ho's patient room. Eun Sub tells Eun Ho, who is in a coma, he is just upset with Eun Ho for hiding his Gundam, not hating Eun Ho. Eun Sub gets tired and falls asleep next to Eun Ho. At that time, Jung Eun enters the room and bursts into tears when she sees Eun Ho on his sick bed. Eun Sub sobs while sleeping, and Jung Eun sobs as she wipes his tears.

An emergency arises in the hospital, but when Eun Sub sees bloody patients coming in, he runs away to the rooftop and has a hard time. Jung Eun drags Eun Sub impatiently and says he should not hide when patients like his brother are dying. Eun Sub reluctantly heads to the emergency room and sees a patient vomiting blood in his mouth while he is forced to treat the patient. Eun Sub accurately identifies the patient's condition and saves the patient from an urgent crisis.

Eun Ho wakes up with his memory back to 13 years old. Eun Sub comes to Eun Ho with Jung Eun when hearing that Eun Ho has woken up. Hyung Jin calls Jung Eun and tells her it is up to her whether she stays, and Jung Eun says she will take care of Eun Ho. Eun Ho is discharged from the hospital but refuses to take the car to go home. Eun Ho cries when the scene of a car accident flashes through his mind, and Jung Eun hugs Eun Ho and comforts her like his mom. Eventually, they go home by train.

Eun Sub and Jung Eun meet Min Jung, Eun Ho's friend from elementary school, to help Eun Ho's memory back. Eun Sub introduces Jung Eun to the jazz bar where he plays so she can have a job playing the piano. Jung Eun comes to Eun Ho's home to take him to the hospital, but she cannot find him. Jung Eun and Eun Sub look for Eun Ho everywhere, but Eun Ho is nowhere to be found. Jung Eun hears strange sounds in the attic while waiting at home. When she goes to the attic, she finds Eun Ho crying.

When Jung Eu, Eun Sub, and Eun Ho have dinner together, Jung Eun finds out Eun Ho hates eggs, and she cannot hide her disappointment. When Nam Jin calls Eun Sub and says Jung Eun did not come to play the piano, Eun Sub feels something is wrong and goes to find her. Eun Sub finds Jung Eun collapsing in the bathroom. Dal Ho comes in a hurry from Jeju and convinces Jung Eun to be back and wait at home. Jung Eun tells Eun Sub she will leave, and Eun Sub is disappointed.