Choi Sooyoung is a fugitive. After taking a valuable research object and running away once he tamed the tentacle creature, he hid himself.

...

In the small town Sooyoung came to, he walked in the crowd while hiding his identity. He bought food supplies at a market. He was walking with his things but accidentally bumped into you.

"Sorry." He said indifferently.

Well he's not that friendly, and at the same time you saw the tentacles hidden under his cloak.