Both dramas have a awkward protagonist with low self esteem. They feel unworthy of their crush's attention and care.

Both Psychopath Diary and The Kidnapping Day are crime dramas with dark comedy that feature Park Sung Hoon.

Both are thoughtful and sensitive queer dramas that feature stunning cinematography. There are a number of subtle touches that hint at sexual tension and budding attraction under the surface.

Both are BL Thai dramas that focus on the sexual awakening of young men. Fighter reminds me a lot of Teh. They both push the physical boundaries with their enemy turned friend. Teh and Fighter continuously hurt the other person (Oh-aew and Tutor) with their thoughtless actions because they are in denial about their sexuality. If you enjoyed Fighter and Tutor's journey you might enjoy Teh and Oh-aew's (or vice versa).

Both are BL cohabitation dramas that feature a actor that desires to get close to his reserved and reluctant housemate.

The protagonist travels back in time in both dramas and tries to change the tragic fate of their classmate.

Both dramas feature a budding relationship between an adult and a minor. Whether or not the relationship in Minato Shouji Coin laundry will turn romantic remains to be seen (only 2 episodes have aired so far). In both dramas the younger one is the aggressive pursuer and the adult is reluctant to date them because of the age gap.

Both dramas feature a gay romance between a character that is cold and distant and one that is hungry for love (clingy af). Both love interests like to push the male lead's boundaries

If you enjoy the chaotic energy of one I'm confident you'll enjoy the other. In both shows they play a variety of games and they are given missions they have to complete. If they don't succeed with their mission they get penalized. Both shows are pretty funny.

*Both female leads are bullied at the beginning of the drama
*They both transfer to a new school & try to hide their true selves in order to keep their friends. Both are terrified that their secret will be exposed.
*Both True Beauty & School 15 have a love triangle. One is a model student while the other is seen as a screw up.
*Both dramas feature a bad boy whose resolve is soften by the female lead

Both dramas have obsessive male leads who are withdrawn and angsty. The only bright spot in their lives is the female lead. They're both very protective of her. In both dramas their whole lives & every decision they make revolves around her.

Both male leads hide their dark sides behind a friendly facade. As the drama progresses that mask starts to slip.