She is chuckling when eating the noodles, because her methods still works on him. That is the difference between MoSheng and HeYiMei. HeYiMei would force him to go to the supermarket, would regularly ask him out to eat, and he would do so out of courtesy etc. Yet MoSheng, just needs to say SHE is hungry, and YiCheng would take care of everything. Notice, YiCheng has breakfast ready for her every morning as well. If she says she is going to ask another guy to take her to the school reunion, YiChen would drop everything and take her instead. When MoSheng was drinking alcohol with his classmates at the reunion, YiChen was drinking water. As MoSheng later shamelessly says to him, if she never left, he wouldnt have such poor health, not that she can take care of him, but because he HAS to take care of her, thereby taking care of himself.
Incorrect, drama name is My Sunshine, starring Wallace Chung and Tiffany Tang. You Are My Sunshine is a movie ( Huang Xiaoming and Yangmi ) The drama My Sunshine is 100 times better than the movie.