Looking for yaoi

A yaoi about a detective/police guy who often goes to a cafe to see his favorite bartender. The bartender has has ponytail and always comforts the detective, but it turns out that the bartender is the masked thief the detective is chasing. He goes around stealing jewels (apparently 7 precious things because his grandfather tells his to)

In the end, the the detective quits his job and works as a bodyguard for the thief