Perhaps because Song Shuhang's disguise was pretty good, no one discovered his real identity as he looked for a registration point, completing his registration. No one started yelling 'Senior Brother Gao Sheng must die' and other similar sentences.
Although the staff member was giving him strange looks due to him wearing sunglasses and a flu mask, he wasn't a police officer. His only job was to accept the money and check if it was real.
Song Shuhang paid the tuition and left his signature right next to his name. After that, he left the registration point.
Now that I've dealt with the registration thing, I'll head back home and wait for Senior Drunken Goon's flying sword to come over. Then, I'll wait for Ye Si to return, Song Shuhang thought to himself.