C45 Because of His Heartbeat
"Dong Yun is not suitable for Muh Yan. Although he can deal with Lyi Qing, he can't fight against the family or protect her!"
When he first met Hee Ya, he had investigated Hee Ya and all the personnel around her. He knew Muh Yan's past and identity like the back of his hand.
The Ji family's influence was only in S City, so there was no need to consider it