AvenueX pointed out on YouTube (minute 29:00) that eps 14/15 feature a before/after marriage hairstyle change for Zhao YunLan:
“…now they live next door to each other & they are a family. Right after that in episode 15, Zhao YunLan changed his hairstyle. The actor joked that it is a signal for ‘I have found my good friend.’”
“Whereas everybody who is watching the drama is like ‘no, that means you have found your husband.’ Because traditionally in Chinese culture, when a woman marries, she changes her hairstyle.”
Lady Karasu 