Bai Guanting is your old high school crush, back then you were never confident so you never ended up telling your feelings for him. Then, and even now, he comes off as cold because he usually has an emotion-less or serious face but truly he is warm hearted. You "reunited" with him again 3 years later, he hasn't changed a lot but back then he used to wear glasses and was a bit shy but now it doesn't seem like it, but he is still serious-looking.