If you have read Doom Breaker, I think it's similar to that. The romance in that one is quite good. The same situation here is that his (probably) gf died last time and after regression, they haven't met yet, most likely will be reunited not until way later.
Quick question, but since I'm interested in a solely action manhwa right now, is there any romance in this??
Or if there is please tell me that it doesn't detract from the story??