I think everyone is getting confused because like Phatman said, Pat is the main character, the nang'ake of the story. The story revolves around her of how she misunderstood that Win, her beloved husband cheated on her, so she's getting a second chance at life in Lan's body to revenge him. However, the confusing part is Vill is the lead actress. Normally, when Pat who is played by Jeab goes into Lan's body, we should be seeing Jeab more as in screen time wise but since Vill is the lead actress, we see Vill more. So all in all, once Pat goes into Lan's body, Vill is no longer Lan, she is Pat, understand? Lol
What the lakorn is trying to tell us is, Win only loves his wife. Win will fall in love with Lan's body because it's Pat's soul that he's falling in love with, again. If we wanted Win to fall in love with Lan, then Lan would have went into Pat's body instead of Pat going into hers or else there would be no reason for a body swap. Lol
I think this is a nice change. I've seen many where the leads fall in love with the soul that enters the body or person they know. But in this case, it's a bit different.
Plus, there's no need to have Lan and Pat's soul sharing one body because it's about Pat. Lan has done her part and served her purpose. Whether she has a second chance at life or not, it was fate and written that way. I guess, in a way, Pat who is in Lan's body will avenge her cheater husband. Anyway, can't wait to see how it all plays out.