Si Yuchuan is the captain of the Third Squad, once celebrated as impartial but ultimately abandons Xin Banyue after her infected scratch to protect the group. He prioritizes the weak space‑user Jin Huamian over her, causing deep hurt. Later he is consumed by regret and frantically searches for her. He is a skilled fighter but allows his feelings for Jin Huamian and the need for security to override loyalty.
