The Fox finds love tokens

When Chu Yun next tried to open the box's iron lid it slid off easily, no longer fixed in place by the lock mechanism.

The inside of the box was no different than the outside, but its contents were surprising.

Chu Yun took out a jade hairpin he had never seen before. He was certain it wasn't one he'd ever seen his brother wear. The decorative end of it was sculpted like a plum blossom, a key note of Chu Hean's scent. 

This was a love token. It was very unlikely that something like this would be given in friendship, it was impossible to miss the implications.

He passed it on to Xiao Zai, who turned it around in his fingers and arrived at the same conclusion Chu Yun had. "You think Chu Hean had a lover?" He paused, thinking on the implications further. "From Su?"