Additionally, we just finished reading about the Advanced Team Warfare Level (ATWL) exam. Bai Chunian is waaaaaaay above the level for the exam so Yan Yi and Lu Shangjin, married omega-alpha pair, want Bai Chunian to help their teen omega son Lu Yan pass this exam. Bai Chunian insists on bringing Lan Bo with him for this. So their team becomes: Lu Yan, Bi Lanxing (greenish hair, Lu Yan's alpha, not together yet at this point though), Bai Chunian, and Lan Bo. The exam itself is virtual reality so nothing happening in it is actually real. The purpose is to defeat all other teams. While in the exam, they come across a snake alpha. Back in the 109 Research Institute, there was a short period where the researchers took Lan Bo away from Bai Chunian and placed him in another box with the snake alpha. You can guess what happened there. When Lan Bo returned, he spent the entire night soothing a distressed Bai Chunian. The snake alpha then taunted and hurt Bai Chunian, which enraged Lan Bo and he went and killed the snake alpha later. So the one we see in the exam is not real because the guy is dead but Bai Chunian didn't know Lan Bo killed him for his sake. Lan Bo has done a lot of things to save/help Bai Chunian at this point but Bai Chunian is unaware of them all and thinks that Lan Bo just didn't want to stay by his side anymore.
so we're at this point: they're both in love, already recognize each other as their mate (but have not officially made the permanent mark just yet), but due to miscommunications and misunderstandings between them, they still have a lot to learn about each other and to grow together.