There's indeed nothing all that special about TOSSARA, but the story is fine and the delivery is acceptable.

Gun has been in love with Bar for several years, but he has never dared to confess to Bar until Bar loses his engineering gear. (Yes, there are several nods to SOTUS, which unfortunately invites comparison with a classic BL).

A lot of people are unhappy with casting Win as Gun because he doesn't look the part of the handsome, muscular guy whom lots of girls in his university go crazy over. I can understand this, and I partly blame it on the make-up department who could have at least given him a nicer hairstyle and image. But I find that he is pleasant looking (he looks better in an interview than in the series) and has played his role well enough. I originally thought that the element about Gun being a very handsome and popular guy was unnecessary for the story and should have been modified after Win was chosen to play Gun. However, it does become quite important for the story, particularly in the freshy competitions scene in which Gun publicly expresses his love for Bar and asks Bar to be his boyfriend.

Win actually plays the part of an infatuated Gun rather well even though it is a bit of a stretch to imagine him as this handsome, muscular popular guy. After a while, he does look fairly compatible with Folk who plays Bar. Folk, on the other hand, is cute but his acting is inconsistent. He doesn't seem able to convey Bar's underlying affection for Gun when Bar is putting up a tough front.

Bar's change from being reluctant to let Gun hit on him to feeling affection for Gun also seems rather sudden. We see that he has fallen for Gun but we don't see why or how this happened. In fact, Gun merely flirts with him for a week and suddenly he seems to be in love with Gun.

The series is not an example of a great BL series, but the couple is rather likable. Both Gun and Bar may get unnecessarily jealous, but the ultimately have rather human concerns and genuine affection for each other. Not a bad watch if you have run out of BLs to watch.

One thing that could certainly be better is a stronger exposition of the characters that would be the main characters in Love Mechanics. I watched Love Mechanics first, but watching TOSSARA hardly makes me understand Love Mechanics better.