The relationship of Teh and Oh faced new hardships as they got older and they both dealt with them in their own way.
Throughout the series Oh behaved maturely, didn't want to jump into conclusions even after he saw Teh cheat with his own eyes. At the same time he maintained his pure and naive attitude, letting Teh hurt him over and over again. Teh on the other hand, although older, was just as immature and selfish as in the first series. His character was rather unlikable, making all the wrong choices and saying all the wrong things. I do see that he loves Oh, however he keeps messing up and continues hurting him, expecting to get yet another new chance, which to me is just cruel.
As a hopeless romantic and strong believer in destiny I am satisfied with how the series ended, but in real life, if I was one of Oh's friends, I would advise him strongly not to go back to Teh, because he clearly has some emotional issues to work through, and before he does, he's no material for a long term partner.
The acting was brilliant, the cast portrayed the characters and their emotions in a natural way. I also appreciate the visual aspect of the show, the shots and color grading deserve praise in my opinion.
I would definitely recommend it.