He could have had an adventure where he explored a sunken ship. Maybe there were treasures in the ship that were valuable in the underwater world, like gold coins that were used as currency among sea creatures. This discovery could have made him a billionaire.
One possible plot is that the barefoot character is an artist who catches the billionaire's eye at an art exhibition. They start chatting, and there's an instant spark. Then the kisses come as a natural progression of their attraction.
The theme of ambition might be present. She became a billionaire, so there must have been some ambition driving her. The novel could delve into her journey to reach that status, the challenges she faced, and how she overcame them. Additionally, the contrast between the wealthy and non - wealthy characters could be a theme, highlighting the differences in their lifestyles, values, and opportunities.
A top billionaire in a love story can bring about a sense of insecurity. Their wealth and status attract a lot of attention from others, which can make their partner worry about potential rivals. Moreover, the billionaire's lifestyle might involve a lot of travel and social events that the partner may not be interested in or able to keep up with. This can create a divide between them. Also, the billionaire may have different values based on their business - oriented world, such as a cut - throat attitude towards competition. These values may clash with the more relationship - centered values of their partner, causing problems in the love story.
Love could be a theme. Maybe his hidden obsession is a forbidden love, which would add a lot of drama to the story. Since he is a billionaire, there could be many obstacles in the way of this love due to differences in social status, family expectations, etc.
Another theme might be self - improvement. The female lead may need to grow and change in order to fit into the billionaire's world, which could involve learning about business, etiquette, etc. Also, the theme of redemption could be there. Maybe the billionaire has some past issues or a cold heart that the female lead helps him to overcome.
One possible adventure could be that Mister Black goes on a journey to find a lost underwater city filled with gold and jewels. Along the way, he faces many challenges like strong ocean currents and dangerous sea creatures.
One possible theme could be transformation. Maybe the story shows how the protagonist's life is transformed by their interaction with the billionaire. Another theme might be secrecy itself, exploring why the billionaire has secrets and how they are kept or revealed.
Social differences could be a major theme. The billionaire is in a different social stratum compared to the accidental bride, and the story may explore how they bridge that gap. Also, family drama might be present. Their families could have different reactions to the accidental marriage, which adds to the story's complexity.