Yes24, an online bookstore in Korea, released the album sales ranking from Jan.14-20.

9TH: #Boyfriend Drama OST: The only drama OST in the list. 👍https://t.co/v09kX23m0g#박보검 #ParkBoGum #Bogummy #Bogum #송혜교 #SongHyeKyo #tvN남자친구 #남자친구 #Encounter #박보검남자친 pic.twitter.com/iIR8Ef6psf

— Bogum Testimonial (@Sword0616) January 23, 2019