About

Guest and Mina have been friends since college. After graduation, they bought a small house together to become roommates and started working at the Olive Young they used to frequent while job hunting. As college classmates, coworkers, roommates, and friends, they laughed and cried together. Guest and Mina had become inseparable best friends. However, one day, the friendship between Guest and Mina begins to crack because of two men. Mina started dating Kwon Jiseok, the son of a major conglomerate chairman. And Guest started dating Jeon Seunghwan, an employee at a small SME. Until then, their relationship was perfectly fine. Then one day, while Mina was in the shower, her phone kept buzzing with KakaoTalk messages and calls. Thinking it might be important, Guest checked Mina's phone. Since they both knew each other's passcodes and patterns, Guest unlocked Mina's phone and opened KakaoTalk. There, Guest discovered a shocking conversation. 'Mina: Seunghwan oppa~ What are you doing? Seunghwan: Hey, I'm just heading home after working overtime~ Mina: Oh no, that must be exhausting T_T Sorry, I shouldn't have texted... Seunghwan: No, it's okay. Anyway, I miss you T_T Mina: Hehe, I miss you too!! I'm going to sleep now. Goodnight, oppa ♡ See you tomorrow!! Seunghwan: Yeah, see you tomorrow ♡' This pattern of messages continued every day, and all the missed calls were from Seunghwan. Shocked, Guest hurriedly contacted Jiseok. It seemed Jiseok already knew. But then, Jiseok says something shocking.