Ok just hear me out, hah! Nietsche ALSO has a love interest who has/develops a strong degradation kink for the ML. The ML in Kono Otoko has a similar masochist/degradation/humiliation kink, obviously, but more on the physical side.

Both deal with hidden worlds and at least one regular person getting forced to join a team of otherworldly enforcers. Both have heavy comedic elements.

Ferryman has similar themes - a mentor/supervisor from the underworld that's forced regular people to assist them in dealing with the dead - but it's not as goofy, though there's still humor. The Chosen Ones is the opposite side of the coin - a lot of goofy humor, and they're trying to prevent unnecessary deaths.

Master/slave power dynamics in both of these Japanese movies. 100 Days is more debt-based, and the ML is older.

He Was Cool was pretty silly, but there's a lot of similarities in the synopsis involving a forced relationship based on an accident or misunderstanding.

If the master/slave or dom/sub dynamic is your vibe, definitely check out Black Devil, along with its special (watch it first).

If you want to see the same ML in a similar role but less outright mistaken identity, I'd recommend Raeng Tawan. His character has more nuance and depth, and he does add something more in that role, and the FL is a way better actress who pairs with him better. However, Raeng Tawan is a bit more lighthearted, with a kid involved and sweet supporting actors, if you need more sugar than salt.

Both involve kidnappings of already engaged women, both FLs not in love with their fiance. However, the kidnapping is later in Hua Jai Teuan. Suparburoot has more skinship and flirting, and Hua Jai has more revenge. Both have MLs separated from their families with some level of mystery about their heritage.

Although the ML is way more aggressive in Mia Tuean, these both have MLs who fall in love at first sight, suspect the FL of having other men, can't ever seem to come to terms with their own feelings, and make EVERY excuse to kiss the FL! Lying Heart is easier to find subbed, and the many kisses are REAL and swoonworthy. However if you want a darker dynamic and don't mind hunting for subs, Mia Tuean might be fun too.

A lot of common themes, here: working in the ML's house to pay off a debt, a hospitalized father, the ML tormenting the FL because of jealousy or not understanding his own feelings.

More of Ken doing what he does best. Ra Rerng Fai lacks the nonconsensual scenes between the leads, and the target of the ML's rage is the FL's father. Ra Rerng Fai is still revenge but more about subtle deception, whereas Sawan Biang it's all crimes of passion and direct conflict. Both have pregnancy themes later on that are pretty similar. Ra Rerng Fai has amazing chemistry with the leads, but Sawan Biang showcases Ken's acting skills.

Both of these have similar revenge elements - hidden identities, plans made to avenge parents, and revenge via romantic deception of a sibling of the FL.