The advantage he had was that he had Ye Mufan's face, so it was as if Li Si An was the one who chased after the man and threw him overbearing and so bold to Su Yu.
When Li Si An rekindled himself to save Su Yu and nearly died, he was returned to his world. Right on the morning of the wedding.
That was when Ye Mufan ran and was chased by Su Yu.
Li Ji An manages to stop Su Yu from killing her future husband and tries to find out, why
Because he had killed Huo Mian.
Su Yu met his father at Su Financial. Apparently Old Madam Su had made a complaint and it was not successful enough to get Grand Master Su Yu to approve of Old Madam Su's plan.
Su Yu was happy that his father wisely said,
'Li Si An is entirely your responsibility. You know what's best for him, it's your choice whether you will leave him now or you will help him get back on his feet.
Master Su didn't mind that his son had to help the Li Group rise, he supported him.