Gave this one a try because I found the summary very unique and interesting. I tried to appreciate the drama because of all the sweet scenes there is but sadly there is nothing more to it.
The scenarios are very typical overused k-drama type with the getting drunk, piggy back ride, and more. The interaction of the characters seemed odd and rushed for me. Side characters are too cringey for my taste as well.

Therefore I'm rating this a 5.5/10. The Night of the Comet was underwhelming for me. The only good episode here for me was the last episode where the characters and plot line got seriously substantive and emotional. I loved the part where he said "parallel lines do not cross but hearts that have crossed will never be apart" it was trully heartwarming that it finally gave this drama a chance to redeem itself a little bit.
The idea of parallel universe and alter ego was very fresh and cute how I wish they plotted the story line better! T_T