Peach Trap

Beside that the dramas are from Korea, Secret Relationships is also about the protagonist entangling with three men.

Both give off the same warm vibes: that unspoken love for someone close to you, a protective, good hearted green flag ML. Story that leaves you with good feeling.

Three guys sooning over for a cute boy. It's similar in the love triangle factor but not necessarily a harem like this drama. The third love interest gets introduced later in Jun & Jun unlike this show. I recommend this if you liked watching Secret Relationships and Peach Trap.

Both are Korean BLs in which the ML finds himself unexpectently the object of a love square.
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There is more than 1 love interest (1 of them being his best friend) in both of them

The best friend is jealous whenever the mc interacts with any of the love interests