I Will Become the Sweetheart of the Prince. Brother Four Emperors, Just Be Anxious.

My husband has a twin brother. They look exactly the same, except that my husband has a beauty mark at the corner of his eye. I have to stroke his beauty mark every night to feel at ease. But every time this time comes, his expression will change from gentle to crazy. The days after marriage were spent in sweetness, until one day, I discovered the secret between him and my brother...