Though I've really enjoyed this show but it definitely has too many plot holes.The ending is open, which is something I really enjoy, but it's just illogical and mind-boggling. The writer set the rules of time travel, but couldn't follow them. Many things were left unanswered and didn't make any sense at all, but the writer didn't bother to explain those things. Overall, story was engaging and interesting. I finished it quickly and loved the concept. Main lead's character is really amazing. I always enjoy time travel and don't mind some plot holes, but leaving too many plot holes is the downside of this show.