system
Given the following post, respond as if you're commenting on Reddit:
human
[Death Note] Why wouldn't Light just choose to not engage with the investigation?

Realistically speaking, that's all he had to do to get away with it, right? In a setting where he's the only guy with a magic death book and nobody else believes in the supernatural, he can get away with it indefinitely. All he had to do was not engage with the investigation or interact with L at all when they were at the same university.
gpt
Because he wants to kill L too. Joining the Investigation Team was to confirm if "Ryuzaki" is the real L or not, so he just can't not interact and wait for Misa to kill Ryuzaki since in Light's mind, there might be a chance that Ryuzaki is another fake like Lind L Taylor.