It's very difficult for the living to take away the lost souls, and it's equally difficult for ghost masters, even if they use supernatural power.
The supernatural power Liu Qi controls is obviously much stronger than Seow Yang's.
However, he has encountered much greater peril than Seow Yang, a peril that has exceeded their ability to cope, leaving them with a sense of despair and powerlessness. No matter how unwilling they are, reality has told them that it is impossible to take the lost souls away.
Reversing life and death, resurrecting someone important who has been dead for a long time, this is a price Liu Qi could not bear.
At this moment, Seow Yang is trying to persuade Liu Qi to give up, to not persist anymore.
Since they have already failed, it proves that this path is completely unfeasible, at least they do not have the ability to leave this mysterious road with the lost souls.