I saw this news awhile back and was hoping that it wasn't Tik since they have 2 lakorns already. I didn't know it was for True though, thought it was for Ch.3. I just rewatched the Mam K./Chatchai version recently and it's decent. Mam K. was so pretty back then.
The story is pretty easy going. It's a mix of period/modern. In the olden days, Nok Yoong (Mam K.) knows magic spells cause her family knows it and her aunt taught her. Ayuthaya? was in the middle of war so her dad and brother went off to fight. To protect her and their house, they put a spell around the house to make it invisible to everyone and somehow it also locked them in a time freeze. Chatchai asked her to run away with him but before she could go meet him, her dad put the spell around the house so they got separated. Past Chatchai was a player and not so good of a guy.
Then in the present, the spell is starting to weaken so Mam can get out and about and she finally realizes it's like 100+ years later. Then she meets present Chatchai and the story goes from there. Now here's the weird thing, present Chatchai is not the reincarnation of past Chatchai. Past Chatchai was reincarnated in the present to be a guy played by Ron, and he's still a jerk. Present Chatchai just has the same face so the conflict is Nok Yoong thinks present Chatchai is the reincarnation of her past lover but he isn't. She wants him to remember the past and present Chatchai wants her to love him, and not just because of his face or because she thinks he her past lover reincarnated.