Gao Yi roughly knew what was going to happen next.
It was supposed to be a simple transaction, one hand passes the person, the other hand passes the money, if there's no money, violence ensues, and if there is, the deal is done and you can leave.
But Fesari, having noticed the significant backing Gao Yi and his associates represented, genuinely wanted to recruit them and establish a long-term cooperative relationship. Typically, this would be beneficial since any assassin organization needs such super-rich and law-defying prominent clients.
However, the problem stemmed from Gao Yi's use of the Secret Action Bureau as a backdrop, which made rich clients uneasy about employing an assassin with an official backing.
Therefore, if Fesari wanted to use the Sky Garden, he had to make Gao Yi and his crew muddle through murky waters, leaving stains on them that would linger for a lifetime.