Married to the secret Australian Mafia Boss

In the outskirts of Sydney, a place where the Mafia are the government, there was a boy called Calvin. He is a final-year student at Brimford University, Sydney, Australia. At twenty-nine, he has achieved what an eighty-year-old man cannot. He is a handsome guy with a lukewarm personality—not too cold, not too warm. He looks quite harmless, yet he is the leader and owner of "Leo Group," the most popular and dangerous mafia group in Australia.
The name of this group sends shivers down people's spines. A mafia group known for its ruthless operations, you are inviting death if you mess with them.
Calvin is basically a solitary person and doesn’t interact much with people. He is also the top student in the entire school.
Dorothy is a fresher who was mistakenly assigned a course she didn’t want to study. All her attempts to change it were in vain. To make matters worse, the lecturers were all on vacation, and the course was not an ordinary one.
Accepting her fate, she started looking for someone to teach her the course. There was no one who could help her except the lukewarm and isolated Calvin. Gathering all the courage she could muster, she approached him and told him her intentions. He agreed to help her but with a condition: he asked her to marry him.