First, the relationship between Gu Yan and Yan Suizhi.
Gu Yan, a student of Yansui, became Yansui's teacher and lover after the explosion and genetic surgery. Alas, this wonderful fate. Gu Yan's parents are soldiers, so he has a sense of justice as a soldier. His grandfather is a judge. Because his parents died young, Gu Yan grew up with his grandfather, so he has a sense of justice as a judge. Gu Yan initially thought that his original idea was the same as Yan Sui's, but after becoming a student of Yan Sui's, he found that they were different. So Gu Yan graduated with different ideas and unspeakable love for Yan Sui.
Second, what kind of person is Gu Yan?
Gu Yan is indifferent on the surface and kind on the inside, so there is no shortage of friends around him. People who don't talk may make talkative friends. Oh, no, not only friends, but also lovers, with bad mouths, haha. Gu Yan loves Yan Sui, but he can't tell her. Although she stopped contacting Yansui after graduation, she still listened silently when her friends talked about Yansui. After Yansui exploded, she began to pay great attention to the explosion.