Okay, the Last Night mv by JxW was wild...and here's what I understood of it:
Jeonghan is a person who imprisons people in their dreams. He does this by making their deepest desires come true while they sleep, making them never want to wake up. In reality, he's searching for his lover, whom he has lost, in other people's dreams. He gets sidetracked, however, as he travels through people's dreams, making them remember him as "This Man." He does this because he fears being forgotten like his lover. So when we think about it, Jeonghan isn't exactly evil, just lost. But the more he does this, the fuzzier his memories of his lover get. His memories are slowly getting covered by a "white sheet," as we can see in the mv. Wonwoo is a person who wakes these people up from their idealistic dreams to reality. Originally, he's just there, watching people live their lives. But when people start talking about "This Man," he realises he needs to stop whoever's doing this. This is why he's searching for Jeonghan to try and stop him from doing what he's doing. Throughout the mv, we can see that Wonwoo slowly realises why Jeonghan's doing all this in the first place. Therefore, Wonwoo's original thoughts on Jeonghan eventually change. Meanwhile, Jeonghan's memories get even fuzzier, and in desperation, he traps the entire city in dreamland. After Jeonghan puts the city to sleep, Wonwoo's able to find him. There, Jeonghan surrenders, tired by the burden of trying to find his lover. So, Wonwoo erases Jeonghan's memories while bringing the city back to reality. At the end of the mv, from the lemonade, we can take away that even though Jeonghan doesn't remember what happened, he can still remember Wonwoo helping him. However, Wonwoo's the only person with his memories intact.