Odd Relations: Fan Letters From My Fake Mom

Jae-Hee loves Jeong so much that he stays his friend even after Jeong gets married and has his son, Yoo-Ahn. Hearing little Yoo-Ahn calling his mom triggers Jae-Hee's jealousy, and he tells Yoo-Ahn to call him ""Mom"" when they're alone. Unfortunately, this becomes a kink that makes it impossible for Jae-Hee to be around Jeong and his family, and he ghosts them soon after. But when Jae-Hee runs into Yoo-Ahn 14 years later, Yoo-Ahn not only remembers Jae-Hee's shameful kink but also confesses his love for the older man! Could their impulsive night together be the start of a questionable romantic relationship...?

(Source: Tappytoon)

Note: Includes one extra chapter.