I think the writers have had a hard time writing these characters since oh the story is not presented at the same…
Hey, I'm just gonna jump in here with my own wild speculation cause I've been trying to makes sense of the same thing. I'm thinking that this episode showed how Yi's motivation is to care for Diao, but it's warped into this obsessive focus on control in order to "protect". + His worry about failing to protect Diao is channeled into anger.
If this is how he's been acting I think Diao's lies makes sense. I kinda see it as a typical overbearing parent dynamic. If someone is too controlling it's a natural defense mechanism to hide large parts of your life. Even for more innocuous things your do, for anything that might be an issue it's less of a hassle to lie. Also, if Yi act out in anger, that's even more reason to not risk facing that anger, and default to lying. That's how I make sense of it anyway, I guess coming episodes will explain more.
If this is how he's been acting I think Diao's lies makes sense. I kinda see it as a typical overbearing parent dynamic. If someone is too controlling it's a natural defense mechanism to hide large parts of your life. Even for more innocuous things your do, for anything that might be an issue it's less of a hassle to lie. Also, if Yi act out in anger, that's even more reason to not risk facing that anger, and default to lying. That's how I make sense of it anyway, I guess coming episodes will explain more.