About time and The Master's Sun is similar as the main male leads are the one that stops the nightmare / Special ability of the main Female lead. Although in The Master's Sun, Gong- shil (Gong Hyo-Jin) sees the souls of dead people and Joong- won (So Ji-sub) is the one to stop Gong-Shil from seeing the dead people by touching her. Where as in About time, Lee Sang-yoon character stops the lifespan time on Lee Sung-kyung
character by just being close to her.
So The Master's Sun is closely similar to About time.