Bumkey - Breathing All Day (Suspicious partner OST Part 6) (Bumkey - Breathing All Day (Suspicious partner OST Part 6)) Ji Chang Wook - 101 Reason Why I Love you (Ji Chang Wook - 101 Reason Why I Love you) Seenroot - Why You? (OST Part 1) (신현희긴루드 - 너는 왜) O.When - How Do I Say It? (OST Part 2) (오왠 - 어떻게 말할까) Ra.D - The Same Day (OST Part 3) (라디 - 똑같은 날) Cheeze - Suspicious Partner (Suspicious partner OST Part 4) (치즈 - 어떨까 넌) Kim E-Z of Ggotjam Project - Eye Contact (Suspicious partner OST Part 5) (김이지 of 꽃잠프로젝트 - 눈맞춤)