Love to the left, love to the right

A series of anonymous letters reminded Ji-hwan (played by Cha Tae-hyun) of his two former friends. Five years ago, Ji-hwan worked part-time in a coffee shop. One day while taking a break from his busy schedule, Soo-in (played by Son Ye-jin) and Kyung-hee (played by Lee Eun-joo) walked into his lens and into his life. Because he fell in love with Soo In at first sight, but when Ji Huan confessed to Soo In, Soo In politely refused. But Zhihuan did not give up. He once again begged Xiuren in public to give him a chance. Xiuren and Jingxi both liked Jihuan's straightforward character. From then on, the three of them often walked together and established a friendship. The three of them cherished their friendship very much. But when they felt a vague love for each other at the same time, Xiuren and Jingxi expressed the embarrassment of the threesome to Zhihuan, so the two girls left Zhihuan. Time has passed, and Zhi Huan still cannot face their departure. The appearance of the anonymous letter also gave him the urge to look for Xiuren and Jingxi. At this moment, he learned a little-known secret...