Lee Du-Na!

When Won-Jun moves into a new apartment for his first day in college, he was not expecting an ex celebrity, Du-Na, to be living downstairs, hiding from her past life. Won-Jun finds Du-Na strange and avoids her at first, but soon finds himself in her room without realizing what he is getting himself into.

(Source: WEBTOONS, edited)

Note: The chapter count included 17 extra stories and an epilogue.