Maybe it's because he was alive in the 90's, when the internet wasn't much of a thing, and people didn't really communicate via short messages -- but Jia Hao has absolutely no concept of how a normal text conversation is supposed to go.
Also, he overshares, a lot.
[Jia Hao: Hello, I'm so happy to talk with you, I'm a huge fan! I watched your previous drama 'Love Unbound in the Countryside' in this store that was selling TVs, and I thought you were great in it. You can tell you really improved since your debut, although I thought you were really charming in 'Friends for each season'.]
[Summer Sunligh: uhm, thank you, but why were you watching the drama in a store?]
[Jia Hao: oh I don't have a TV. By the way, you should grow your hair out, you looked really cool as Pei Su! Reminded me of my senior in high school. Thinking back I think I might have had a crush on him haha]
[Summer Sunlight: ha ha]