Lovesickness (2024)

Both show's stories are somehow similar. In Lovesickness, FL time traveled in the ML era, but in An Ancient Love Song, ML time traveled, and they tried to change the history and tragic end of their lover. But in terms of production and story execution, the quality of An Ancient Love Song Show is higher than Lovesickness.

Both involve time travel in which the leads' timelines flow at different speeds, so one is going back further in time while the other is moving forward.