Sang Sik and Joo Eun say their vows and have a beautiful wedding. Joo Hyuk and Woo Jin also promise to one other their genuine hearts and agree to start dating as much as they can. However, without telling the office of their relationship, finding their own time becomes a challenge. They almost get caught after excusing themselves from a company get together. Later, while on their date, Woo Jin runs into her first love that makes Joo Hyuk uneasy.
드디어 서로의 마음을 확인한 주혁과 우진.
설레는 마음으로 연애를 시작하는데..
갑자기 그들 앞에 나타난 우진의 첫사랑!
주혁은 자신이 바꾼 과거로 인해 우진의 첫사랑마저 바뀌어버린 현실에 애써 쿨한 척해보지만..!?
Mientras están en una cita a escondidas, Wu-jin se topa con su primer amor de la universidad, lo cual le provoca celos a Ju-hyeok.
Durante um encontro com Ju-hyeok, Wu-jin acaba por conhecer o seu primeiro amor da faculdade e deixa Ju-hyeok com ciúmes.
