Although Hong Tao was just a teacher, he was not lacking in intelligence.
Last night, while chatting with Lu Han, Hong Tao didn't grasp the underlying meanings of Lu Han's words at the time, but after mulling them over gradually, he came to understand.
Lu Han knew that Tang Shengyi was in the same stock investment group, but Tang Shengyi was unaware that his son-in-law was also a member.
Lu Han was so generous to invite his brother-in-law to join him in making money, which showed that first, Lu Han indeed wasn't one to conceal things; second, he truly considered him a part of the family; and third, Hong Tao believed, Lu Han might need his help to speak up.
Some matters might be difficult for the father-in-law and son-in-law to discuss directly.
It would be easier for Hong Tao, an outsider, to break the ice so that Lu Han could have a reasonable explanation.
Having received Lu Han's kindness, he should help him resolve this situation.