Farewell, My First Love

Some people are just drawn together…literally. Eun Se-eun has never gotten over his first love and eternal crush, the charismatic and effervescent Seo Jeongwoo. Unable to forget him, Se-eun decides to take things into his own hands - by making them the main characters of his hit BL series, Can’t Get Caught! XXX. But after returning to his hometown, Se-eun’s fantasy just might become reality when he comes face to face with the man of his dreams (and drawings) once again! As the two begin to reignite their friendship from years gone by, Se-eun must do whatever he can to ensure Jeongwoo doesn’t find out what he’s been up to. He can run, he can hide...but he can’t get caught!

Notes: This summary from Lezhin US is wrong. Rough translation of the summary from the Korean one:
Yoo Eun-Ha learned she only had a year left at the age of 17. And on the day she received her diagnosis came Baek Ha-Yoon, a boy who lost all of his family in a car accident and was the only survivor.
The story of two people who understand each other's pain and become closer in different situations...

Original Webtoon:
Comico, Naver Series, MrBlue, Lezhin, BookCube

Official Translations:
English