Let's hope Yuan Hong can guest as QiXing (QiYou's younger brother who's in the 2nd-tier cast...but still gets to kiss Ruby ). Just stole this photo of Yuan Hong & Yan Kuan from Yuan Hong's thread - both of them can definitely pass off as brothers! Though Yan Kuan looks much older.
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QiXing character summary from Ruby's site:
click to show/hide spoilersQiXing (Third Prince) - Handsome; QiYou's half brother. FuYa's best friend, the only guy in the story to have a sense of humor and once stole a kiss from her. A Prince and a tactical General, glorified in battle. He sought to uncover the mystery surrounding his father’s murder, and realised that FuYa was the key to everything. When he found out FuYa’s relationship with QiYou, it was clear that QiYou murdered their father to avenge her supposed death. But when FuYa realised, despite their friendship, he had been using her to stage a coup against QiYou, and was responsible for the death of her sister, she framed him for the death of the Queen Mother. He only needed to implicate her in order to clear himself, but chose not to do so, thus signalling that she meant more to him than his father’s murder, the throne, and his life. He was the first blood that FuYa took, the most regrettable moment of her life.
Too bad Karen Cai sounds so adamant (in her weibo) about not freeing up his schedule