Recommendations

Both of these dramas have something in common, not in terms of the story, but in terms of the vibe. If you've seen both of them, you'll get it.

Similarities:

The main leads fall in love (though Hello Monster has less romance I believe and they don’t get together until the very end)
More serious male lead in both
Smart female lead in both
Different cases get worked on but there is also one main big case leading up through the series
The chemistry is better for the main leads in WASFIL I believe.
Both are very enjoyable to watch ?

Very similar in the way the leads falls in love and they work on cases together. The leads also have great chemistry!

Similar premise. In Unable Love (Ice/Two), FL is in love with gay ML and tries to make it work through love. This is my favorite out of the three similar CFD stories. It does a good job of portraying how no matter how great someone is or how compatible you are with them, it can't change someone's sexuality. A really well done story that made me fall in love with their friendship and rooting for both their happiness.

The regular guy has to return to his home in countryside then he has met a cheerful boy who is living there and they fell in love

Have a same "spicy taste" and the cast also comical. There's Mijoo in both of show. She's still funny as always but more mature at Witch Hunt. Nara also will come as a guest.

Both portray a world in which vampires live among humans, and a vampire and human end up falling in love.

Both portray a world in which vampires live among humans, and a vampire and human end up falling in love.

Both are about vampires living among humans.
................................................................................

Both are a love story between a human and a vampire with an evil vampire as the antagonist, and a human woman who aids the vampire ML.

Similar premise. In Unable Love (Ice/Two), FL is in love with gay ML and tries to make it work through love. This is my favorite out of the three similar CFD stories. It does a good job of portraying how no matter how great someone is or how compatible you are with them, it can't change someone's sexuality. A really well done story that made me fall in love with their friendship and rooting for both their happiness.

Similar premise. In Khon Thee Mai Yom Rap (March/Mo), FL is in love with gay ML and tries to make it work through love.

Somehow the drama feels so alike with this reincarnation theme. And the lovers meetings again in the present life.

Same strong healthy, unwavering relationship between the main leads. No stupid misunderstandings and break-ups. Very cute and fluffy!! In Love O2O, male lead chases female lead, but in WIFTY, it's the other way around. No second lead syndromes. Love O2O takes place in uni entering society, and WIFTY starts from high school.

Main Protagonist is under the misconception that the other lead is their love rival.
Happens in university/school setting.