The Legend of the Blue Sea
Episode 2
S1 E2:
Mermaids exist, and in modern times they can walk on the ground. They just need to want it. The main heroine comes out of the sea and meets a guy named Heo Joon-jae. There are real feelings between them, just as the ancient legend says. According to it, the young man falls in love with a mermaid and meets her in the next life.