"Li Wei felt abandoned, she was full of resentment, yet she also loved your brother, so she didn't want him to leave, to be gone from her forever. Therefore, she intentionally made your brother aware of the money laundering occurring within the company. Originally, she merely wanted to prevent your brother from going to America, but..."
As he said all these, he was constantly observing Song Qinghuan's emotional responses.
Upon seeing her expression remaining calm and not overly agitated, he continued, "What she did not anticipate was that those people would actually murder to silence others, causing your brother to disappear. It was too late for regret. After your brother left, she was devastated, blamed herself, and was wracked with guilt. She refused to accept that your brother was dead, promising to wait for him forever, which is why she has stayed in the company and refused to leave."