Mo Yi didn't know the exact reason why they quarrelled.
From what they saw, Li Moying and Huang Yueli were an extremely compatible model couple. From how they usually interacted, they knew that both of them were each other's sunshine and even if they quarrelled, it was probably because they were both too arrogant and stubborn, none of them was willing to take a step back or purely because they were jealous of a rival in a love affair, since both of them were just so popular.
Anyway, it would always be because of these childish reasons which led to their argument.
Which couple on earth did not quarrel? As long as they could act as a middleman, giving them a stage to step down, they probably would patch things up soon!
Unfortunately, Mo Yi's guess was totally wrong.