Recommendations

Both are action genre and the protagonist is Mark Prin... Cops chasing the goons...

Complex love story woven in between the police chase.. dangerous villains..

Both dramas centre around the marriage of a celebrity. In Papadol! we see an idol marrying a mother with three children whereas in Mukodono! the idol marries into the big family of his beloved. In Papadol! we see the interactions between children and their mother's new husband whereas Mukodono! shows the interactions of our idol/actor with his wife's family and he becoming a part of it.

Both are cute Japanese BLs. If you like Kieta Hatsukoi's hilarious plot you'll definitely like Ossan's Love as well. Both can he funny when needed but can also be emotional and feel authentic. Both have at times the 'over the top' type of acting that has you laughing to the floor and is so common with jdrama. It has real struggles and makes you immersed into the story. Definitely worth watching.

The struggles youth goes through, but Go Ahead deals with a more complex family structure, Record of Youth is a bit more light-hearted.

It might be because I just finished both of them around the same time but I often thought their similarities how both are struggle of youth and it is heart warming.

Male leads in both productions have to cope with death of their best friend. Both Ao to Boku and Pink and Gray are aesthetically pleasing and feature some kind of plot twist

Both dramas have cops going undercover to break a drug dealing operation.
Both agents have super fighting skills.
Both agents fall in love during their undercover work.
Both agents almost die trying to accomplish their mission.

Both dramas portray a cop who goes undercover to break a drug ring.
Both agents get help from other civilians to help them accomplish their task.
Both dramas have seemingly dirty cops who complicate their task.

Both dramas have Lin Yu Shen as the main lead.
He plays a police officer in both drams.
In Undercover he plays an undercover cop who has infiltrated the drug gang.
In Master, Wait a Moment, he plays a cop who mentors a rookie cop.
Lin Yu Shen demonstrates his super fighting skills in both dramas.

Both dramas are about keeping and discovering secrets.
Both dramas deal with crushes and relationships.
Both dramas deal with school life. All About Secrets deals with high school life, while My Unicorn Girl deals with university life.

Male lead tries to deal with his artistic best friend's death. Both productions have similar vibe, and the plot is introduced through the dead friend's drawings

Older woman, and a younger man...In Love and Fortune, FL is way older like in 30's while ML is in high school...in the other drama, age is no issue, just the FL not wanting the success of the ML coming from her so that ML can stand on his own and be proud of himself

Older successful woman, and a much younger man...In I Hear Your Voice, ML is still in high school while FL is a lawyer...In the other drama, ML is a subordinate at work, FL is the Boss at work

Older Successful Woman and a Younger less successful man...In Witch's Romance, FL gave the ML a chance till she discovered he is way younger...then deal's off...however, the heart speaks for itself...In Oshi no Oujisama, FL ignored her feelings for the ML for a reason...not age

Older Successful Woman and a Younger less successful man...In Find Yourself, FL was well aware she is inlove with ML but just kept him a secret because of societal pressure, in Oshi no Oujisama, FL never gave him a chance in the first place...until it affected her job and personal life....