No Going Back Romance (2020)

A teen romance of So Dam, a sixteen-year-old girl, who has never dated before but she receives her first-ever love confession from a mysterious boy. She is looking for the boy who secretly confessed to her while she…

High school love Story between ML and FL
Teenage problems
School scenes with friends helping each other
Love triangle

both based in high school, fl getting an anonymous confession and trying to figure out who it is from

Both are mini dramas in which the FL is drunk/sleeping and receives a confession or kiss, but doesn't know who it was among several possibilities. She then tries to discover which of the MLs is the one who confessed/kissed her. Both have a love triangle (ML, SML, and FL) and the confession/kiss has an unexpected twist to it.