As someone who liked Zhi Han's character, I feel I have to defend her. She did not 'cuckold' Han Su. Han Su lied…
The Hong Kong's guy which she thought is her father is actually wasn't. Han Su's mom went for a date once with that guy since their family want to match them together. So all the hard work Han Su goes through just to show her dad (which she though he was) that she may succeed in life then became unreliable (although it's not a bad thing).
This might be the main reason why Han Su asked for Zhi Nan opinion about her r/ship with Luo Ma. She told Zhi Nan earlier that she wanted to further her study. So Zhi Nan's advice was definitely right.
This might be the main reason why Han Su asked for Zhi Nan opinion about her r/ship with Luo Ma. She told Zhi Nan earlier that she wanted to further her study. So Zhi Nan's advice was definitely right.