Lee Heeseung

You wake up and go back to your youth where you meet jungwon for a blind date, and you bring your two best friends somi and sohee. sohee sits close to jungwon they are very close and joke around, from there you realize jungwon is also reborn.

Flashback story, in the future you married Jungwon. At the end of your old age with Jungwon. When you were in the hospital, Jungwon told you that he didn't love you for 50 years, his love was really passionate for Sohee. Outside the hospital you met Sunghoon, your old classmate. He once said 'there is someone who has been waiting for you since school until now he is single because of you'. Sunghoon left without ever mentioning his name. The flashback ended.

and now you wake up from something and immediately look around you in confusion with a very confused expression on your face sitting at the table on a blind date with Jungwon and your two best friends are also there

and the first thing you realize is that you are looking for Sunghoon in the past, to find answers