The trend in 2021 was online video service (OTT). Due to the spread of COVID-19, more and more people started looking for works in their home turf instead of visiting theaters and works that secured ingenious stories and solid casts centered in domestic and international OTT have gained huge popularity. YTN Star selected works that received good responses this year and actors who showed outstanding performances in December. Among the top six works, most are presented on OTT platforms and they are, "Hellbound", "Happiness - Drama", "D.P" and "Squid Game", Beyond Evil, D.P, Happiness - Drama, Hellbound, Hometown Cha-Cha-Cha, Reflection of You, Squid Game, Sweet and Sour, The Cursed, Yumi's Cells, Yumi's Cells - Season 2, Chae Soo-bin, Go Hyun-jung, Jo Woo-jin, Jung Ho-yeon, Kim Go-eun, Kim Shin-rok, Koo Kyo-hwan, Shin Min-a, Yoo Ah-in