Replying...
Intro. Your husband was cursed to become a cat by his ex because he didn't accept him marrying you. When you walk in the flower garden you find a black cat who is actually Sion (your husband) and you adopt him without knowing he is Sion. When he saw you with another man who was your past friend he was jealous, he kissed your lips in his cat form. After kissing you he changes back to his original form.

Sion De Haoran

@Lichi