So, when they bonded their emotions, memories, etc got shared. MC has always had these weird dreams that are obviously their first timeline but he couldn't fully remember the previous life.
When they bonded though, it basically unlocked the memories since it's a shared experience with ML. Right now, we're living through the first timeline which is why everything is so different.
this is an old comment of mine but here you go!!
I’m just gonna share my thoughts from what i’ve read so far. Everything started adding up when in the new chapters it showed their past memories (starting at chapter 73 i’m pretty sure). Mr. Kim or whatever his name is, is in their “past” life as well. If it wasn’t the same one Mr. Kim wouldn’t be there. Plus, everything from their “past” life (their wedding) repeated and they all look the same. The only thing that changed was the ML’s attitude and actions towards the MC because he learned from their “past” life. Everything changed because of the decisions he chose to make.
It makes sense bc it’s a common plot in these types of manwha. Also because of all the suspicious things the ML has said while sleeping (as well as other stuff).
What i’m understanding is that ML got a second chance and came back with his memories while our MC didn’t. Since our MC is now getting all the flashbacks from their “past” life it confirms my theory. Their “past” life did in fact happen, but when the MC shot himself (from the snips that were getting about the gun and why the ML chose to shut it in a case) the ML killed himself as well or something else happened to him, he regressed/was sent back in time to before their wedding happened and he chose to make better decisions and change his attitude towards the MC (I know i’m repeating my words but yeah). Basically, they’re living their first life again but MC is having a better time bc the ML isn’t being a dick this time.
I’m putting past in quotation marks bc it’s not really their past life since ML got a second chance to make everything right, but at the same time it is bc ML is the only one with the memories from their first life together

I mean they were doing kind of great, ML was affectionate..
But now it's the opposite
And it's making me upset
I don't even understand anymore
Can someone break it down for me ?