Recommendations

Both dramas show childhood friends turned into lovers with so many misunderstandings
Both are set in school days and show the students' family backgrounds and past.
Both have cute soundtrack selections
There is a love triangle in each of them
One has a strong unrequited love

Both dramas are set in College days.
Both dramas revolve around friends and classmates hanging out together ( They eat out together, go on trips, fall in love, breakup, etc)
Both have love triangles and unrequited love
Even the soundtracks are somewhat similar and give off the same vibe
The leads have been through hardships and have been raised in unfunctional families

As soon as I watched Money Heist, it reminded me of Pied Piper. Both dramas deal with negotiations but Pied Piper is mainly focused negotiation with people in order to prevent bad things from happening.

Cubic has the same tags & same theme as well. Such as: Mafia, Older man/younger woman, strong female lead.

Both dramas have a similar feel, are light in tone with some darker elements, and focus primarily on mystery/investigation with a slow burn romance between the main couple who solve cases together. The ML actor of HDRA is a supporting character (half of the secondary couple) in MM.

Both FLs are quirky, cute, and a bit forward/flirty toward the ML, chasing him first. Both couples work together to investigate cases and solve mysteries. The pacing, tone, setting, and feel is very similar, as well.

Both dramas have a similar feel and pacing, are historical with mystery and a slow burn romance, and are lighter in tone.

Both dramas are historically set, mystery/investigation with romance, and are lighter in tone.
.....................................................

Both have a quirky, cutesy FL and stoic ML in a slow burn romance. Both are mystery/investigation dramas.

Both are lighter toned mystery/romance dramas with a stoic ML and a cute, endearing FL solving cases together in historical China.

Both are investigation/mystery dramas with light romance with the couple working on cases together.

Both of the female leads are actually the last princess from a previous dynasty. Both of them fall in love with the emperor. My Bratty Princess has a happy ending, while Legend of the Dragon Pearl doesn't have as great an ending.

The love story in Nirvana in Fire isn't necessarily tragic but definitely touching. Plus, the actress in Nirvana in Fire (Liu Tao) looks similar to Bai Lu, like the older version. Both dramas deal with rebellions, revenge, political corruptions, etc.

Both are gay dating reality shows. While His Man is Korean with more open ending, Bromance follows The Bachelor formula and it’s a Thai show.

Both dramas are very similar in pacing, plot, and feel. The characters are also similar, featuring a talented, independent FL on a quest, a supportive ML, a single mother (FL vs. SFL), and a child looking for his father (who doesn't know he exists) who bonds with the adults around him who all try to protect him.