Train is not Romance focused but there is some. both are fantasy and they go to alternate timelines in similar ways and again meet FL who has no recollection.

Both have Jang Hyuk in amazing action choreography , one is with swords other is with Guns. both are about saving teenage girl .

Myung Soo Hyun is the Screenwriter of both! which explains why both are very similar in one aspect which is comedy! the best thing about both shows is the unique traits of each characters which makes the interactions between them hilarious. both got that repetitive gags going on throughout the drama

both are very similar in terms of hero fighing over fate and in turn creating ripples that further complicates his course

Both have similar themes of accidentally Freezing for decades and waking up to find that years have flown by and everyone they knew became much older.....

Both has a very similar premise, in both dramas two leads are revived in bodies that are in contrast to their previous bodies and they try to accept new bodies and work through their new chance at life............

well......both has same male lead and both has husband following his wife around. both has funny approach to serious subjects. BUT the main difference is in this movie, husband is trying to get his wife to have an affair so he can leave her with out a fight........