Actually I really not understand the concept that your feelings is just based on an app of your mobile ,so I was curious to know how it would be happen and this make me to watch the drama.
So basically it was an app which tell you that who likes you and if you like him too so you become a couple .
I really not like the concept ,basically you depend on an app totally just like drama she told to him that she didn't love him and that's why she wanted to breakup so he also beloved because his app not alarmed but still he was in doubt then to he accepted it ...
Then in second scene one who make the app he also had a crush but when she came to knew about it she felt embarrassing that he liked her because he was not good-looking as well not fun type person ,he was actually had a boring personality and because of this he started making distance with everybody and then disappeared forever.
Two things they didn't show 1.why he decided 2.why so many people die
Three things I didn't like
1.first lead knew very well that 2nd lead like him a lot then why he become intruder in their matter secondly 2nd lead was the reason that he met her ,okay this thing handle that you can't control your feelings so first lead fall for her and he had courage so he confessed her and their story start
2. Then everything was going well why she broke up ,I really not accepted the reason of her for breaking their relationship.
3.when they all come across then why 2nd lead pursue her though he knew first lead love her lot and she broke up not he ....

What I expecting in second season that 2nd lead and her to be pair because first lead already has someone who love him purely with honesty but anyways what the story it will be.,let see
This drama confused me a lot .
Only because of acting and overloaded emotion connected me with a drama otherwise I would be dropped it after watching few episodes.