Hana & Mr. Arrogant

Reyza was punished by his father - kicked out of the house to learn how to live by himself - because of his arrogant and harsh personality that have never changed. By asking Hana Mayuri to help his son, Reyza’s father have prepared everything Hana needs. But it turns out that Hana and Reyza had an awful past 10 years ago that made Reyza really hates Hana. What actually hapenned between Hana and Reyza in the past?