9 Years Ago, Summer

After one summer-night mistake, former roommates and inseparable friends Cha Jae-han and Kang Yeon-woon spend nine years estranged. Now, Yeon-woon encounters Jae-han again just two days into his internship at Haeo Planning. Yeon-woon still despises Jae-han, but his new colleague keeps appearing in his path. When Jae-han greets him warmly and offers his hand, the gesture brings back a memory from nine years earlier, tightening Yeon-woon's chest and churning his stomach.