I watched SOTUS S right after I watched SOTUS The Series, truth is that I was addicted and desperately wanted to know what happened to the characters after the end of its prequel. Honestly it did not disappoint me in any ways. I personally loved the whole idea and the extra scenes they put in the story. I am still amazed by the love between the main lead characters and their friendships too. Its worth rewatching and will not fail to lure you into their love! The cast and crew who worked on it should be really appreciated especially Krist and Singto who are such professionals to bring out the best out of the characters.
P.S : I found a video of the interview of Kongpob and Arthit on youtube after Sotus S series... which btw is really cool. People who have already watched the series should check it out!