In both dramas the male lead is a supernatural being. He has to figure out his connection to female lead, and at the same time face his destiny.

Both dramas are about gods and deities navigating modern world. While Devil Punisher is heavier on the ghost aspect, both series have a major romance plot as well.

Both are shorter dramas that explore supernatural plots set in modern times. In both the chemistry between leads is really good, and the story is full of twists and turns.

Both female leads get a second chance at their teens. The question is will they be able to change what happened in the past?

Similar "time travelling" theme. Lead(s) travel in time and try prevent some events from happening in order to ease their regrerful hearts.

Both dramas' main character are failed idols. We follow them as they adjust to "normal" life and have to deal with regrets of not succeeding. Working a "normal" job isn't easy either, and love life gets complicated too.
Will they manage to find joy again?

Another drama partially set in the past, tha has you guessing what happened to the characters and what led them to their present life.
Reply 1997 and My First Love Is Secret Love are both heavy on nostalgia, abeit they start 11 years apart.

Also set in 2008, Go, Back Diary is about high schoolers experiencing their first love. Webdrama is short but has a lot of developements packed in just 4 episodes. We are also told what happened to the characters in present time.

Both webdramas are set in 2008 and are about high schoolers living in that time. Very big on nostalgia and accurately potray how teen life was back then.

Both movies are based on mangas by Io Sakisaka. Similar high school setting and overall vibe. Also both have a character who has an unrequited crush.

Both are based on shoujo mangas by the same author. Similar vibe and both stories are set in high school.

An easy to digest drama that features similar themes, such as gender equality or sex education. Characters are young adults, enrolled in university or working.