Ibangin

"A stranger changed my life."
While struggling to survive his troubled life with no one to rely on, Ji-Ho Kim stumbles into Woojung Yeon and follows him. "Favors are not free." Ji-Ho's way of seeing the world paints Woojung as an untrustworthy character, but Woo-Jung's continuous kindness finally begins to open Ji-Ho's heart.
(Source: Manta, edited)
Note: Chapter count includes 18 bonus chapters and 2 epilogue chapters.