He was grieving and also suspected He Rufei in the war. Probably that's why he didnt feel they are not the same…
He is curious about He Yan's real identity. In the novel, He Yan at academy was one of the worst students. She didnt excelled at martial arts too. When she first joined the army and met her master, she improved her skill and learn sword techniques suits her. So He Yan at the academy and General He Yan is very different. Their classmates were also shocked that she become a great general. There are more things to say, but it might be a spoiler for you. Therefore, he still suspects her identity but have no idea his childhood friend is a woman. He got curious about the original masked general later in the chapters.
They needed the military achievements to stay in the capital and since her brother was very weak, she had to take…
I was also expecting the first episode to explain what happened and why but they didnt explain anything.. They also didnt explain other things so... But if you want you can also read the novel. I read it more than 5 times and still having fun watching the drama
I'm not gonna spoil the novels but I guess he's already suspicious. Cause he told Feinu to sent men to 2 different…
He is a spy for Wutou people and Prime Minister. They showed Wutou people in the first episode. Also we saw Chu Zilan talking about planting a spy to Xiao Jue's army. He is Lei..