Help me find this one royal historical bl So it’s about the brother in law of the Korea...

Help me find this one royal historical bl

So it’s about the brother in law of the Korean historical royal princes and both princes seems to be interested in their widowed brother in law and there’s second couple too, it’s the secretary of the mc x the vice commander of the ml and that secretary is secretly a crossdresser I think

Pls help me find thisss