Recommendations

Different Identities combined with contract relationships?
Involving a rom-com??
Ta-dah!
Beauty Inside is the one to watch

The rom-com is similar, instead of fake identity it goes more like changing identity xD
Plus Shin Sung Rok who you normally see as a villain has done the complete opposite here.
He's played a confused comic here xD

Actually, these two dramas are quite similar, they are just that High society is made on a low budget, the characters are fun, plus there's extends rivalry b/w the 2 leads which is missing in Business Proposal!

Fake a relationship to real ??
Hell yeah!
Both are two sides of the same coin.
This is my first life is more authentic and serious at times when needed!

Both are amazing rom-com. Here it's based on Fake Identity, while Another Miss Oh involves Mistaken identity.

Both are mini dramas with a rich ML and the main couple's adorable child serving as a matchmaker for them.

Both are mini dramas with an over-bearing CEO and FL and their precocious young son.
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Both are mini dramas with an over-bearing CEO and FL and their precocious young child.
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Both are mini dramas with an overbearing rich CEO ML and a determined FL with an adorable little boy. In WTWY they are the child's aunt and uncle, in PBM they are his parents.

both are about bromance between high school boys who rely each other, and involve school bullying, street fight and especially Shin Seung Ho, a versatile actor who seems tough and good at fighting.

Both are Chinese historical (war) dramas.
Stories are also quite similar and both about a woman fighting against the Japanese.
Cinematography is not the best, but typical of most Chinese dramas shot during this period (2005-2015). Out of the two, I did like Arrows on the Bowstring more, but both are worth watching if you like these type of stories.

This drama reminds me of Ultimate Weapon Alice. Both are about high school bullying the main character who used to be weak one.

The dramas aren't actually that similar, but they have the same pleasant, cozy and chill kinda vibe. Both dramas will make you laugh a lot, but also cry sometimes. The male leads also have similar stories with trauma, blaming themselves and helping other people. Also the grandma (<3) is played by the same actress in both shows (Kim Young Ok).

So if you like either one of these dramas, and want to watch a show that gives off the same feeling while making you feel at home, then I'd really recommend you to watch the other one too. :)

Both Kdramas have a main guy who was bullied in high school but eventually stands his ground and fights off the bullies. Both main lead guys are strong and they were both a little quiet in the beginning.

The slow but intense description of the serial killer. Abrupt but sensualizing references of the serial killer. Not knowing whether to hate or love the killer trope.