They have almost the same vibe!! But the boy next door is bromance and kieta hatsukoi is bl. There're some funny misunderstandings and soft, really enjoyable stories/characters
The Boy Next Door (2017)
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Both dramas display the same type of humour. While Diary of Tootsies shows gay people. The Boy Next Door is technically not a gay drama. But does portray gay-ish themes.
Both BL parodies. While this series directly pokes fun at BL tropes and clichés, The Boy Next Door imitates BL through situational irony.
Short episodes with a great focus on comedy. Hilarious but sweet. Amusing misunderstandings in both. but there's more of a focus on that type of humor in The Boy Next Door. Great relationships in both.