Mu Yiyi
I think Black Hawk needs to take his ideas to persue his darling Mu Feiran from either Lin Che who being a best friend to Feiran knows her likes & dislikes the best or from someone like Gu Jingze who even though doesn't show it always is a true romantic at heart who is able to plan surprises for his darling wife many times.If they can help him with his proposal then Feiran probably won't be able to reject it mercilessly.