Li Kai and Lin Yu were led away because Chen Tianlong suspected that these two people were not just for show, but each had their own tasks. So, as long as he could get the two out of the way and capture them, no one would carry out the following tasks, naturally activating the inside line.
Initially, Chen Tianlong did not know that Mrs. Hong was the insider; he only knew that there must be one in the company and one within the Lin Family.
After all, if there was only an insider within Lin Group, the happenings at home couldn't be so well understood by the other side, so the only possibility was that there was an insider at home as well.
Unfortunately, these two informants have quite a high professional ethic; no matter how they were threatened, they refused to reveal the mastermind.