Love Theory

Tae-Young, Ji-Won's adorable younger brother who used to follow him around as a child, has grown into a wonderful adult when he meets him after seven years. The joy is fleeting, as the relationship sheds after mistaking Ji-Won for a one-night stand reveals the shell of a longtime childhood friend. Ji-Won is confused by the changing nature of his relationship with Tae-Young. To make matters worse, he encounters Seon-Ha, whom he met in a class he failed to register for, "Theory of Love," and ends up having a one-night stand while drunk. Ji-Won, overcome with a mental breakdown, wonders if he's really that vulnerable to pleasure, but their relationship takes an unexpected turn...

(Source: Mr.Blue, translated)

Note: Includes three extra chapters.