Currently, it's the scene in episode 3 of Siege in Fog. Xin Sang jumps to Pan Jianchi's side and grabs his shoulder after seeing the military guy shooting himself. The look that Lian Kai gave Pan Jianchi was priceless. I re-watched it like 4 times. It's more on a possessive, less on a cute side.
Go Back Couple has several scenes that are really cute. One of them is the scene when the second lead catches the main girl running down the hill due to wearing too high heels. Then the beauty pageant was a really nicely done scene showing a lot of jealousy on the part of main lead.
Cruel Romance has some great jealousy scenes when Jingxiu worries about Yindong being in prison and then trying to convince Zuo Zhen to help him. His face says it all.
The last one is Go Ho's Starry Night. The entire show is about guys being jealous of the girl since all of them get interested in her. It's light and ridiculous, but the jealousy scenes are gold.