There are a few ways that you can hack into a TikTok account. The first way is to use a phishing attack. This is where you create a fake login page that looks like the real TikTok login page. When the user tries to log in, their username and password will be sent to you instead of going to TikTok.
The second way is to use a brute force attack. This is where you try lots of different username and password combinations until you find the right one. This can take a long time, but if you have access to a lot of computing power, it can be successful.
The third way is to exploit any vulnerabilities in the TikTok software itself. If there are any bugs or security holes in the code, then it may be possible to exploit these and gain access to someone's account. However, this method is much harder than the other two methods mentioned above.