In the end, Si Ren still chose not to take action against Li Dan and his companions.
Having returned safely from the Demon Clan royal court, they essentially held a get-out-of-jail-free card. As long as they did nothing to betray the country, they were guaranteed a comfortable life free from financial worries.
Although Si Ren sensed that something might be amiss with them, he lacked any corroborating evidence and could not pin anything on them.
Chapter 1301