I think it might be Grate.
Because with Mart and her there weren't any news at all. Even behind the scenes stuff they weren't as comfy together as her and Grate. Especially, considering it's their first lakorn. Mart was playful..sure enough because he has been that way when on set. But with her and Grate it was like they have known each other for years.
Hahaha...when she said that she didn't like Mart right away...Gosh, that was just too quick. You know when someone denies something too quick there's something there. LOL. But then Mart said he didn't hit on any of the girls on the set of their lakorn...so I wonder who...
Oh, yeah, from BTS Matt is going to be so "Rai" and Grate will be the one to tame her. How fun is that...LOL