Another theme could be sacrifice. Truly loving someone might mean sacrificing your own desires at times. Say, giving up a job opportunity in a far - away place because you don't want to be apart from the person you love.
Growth is also a likely theme. When you love someone so fully, you grow as a person. You learn to communicate better, resolve conflicts, and become more empathetic towards others as a result of the relationship.
It could end happily, with the two people staying together and building a life full of love and shared experiences.
One possible theme could be overcoming obstacles. In a love story with 'black' as a factor, perhaps it's about a relationship that has to face racial or cultural barriers. For example, the couple might come from different ethnic backgrounds where society has certain prejudices. They would need to fight against these external forces to stay together.
Another theme could be self - discovery. As the story progresses, the characters might learn more about themselves through their experiences with love and its fallacies. They may realize their own flaws in how they approach relationships.
One main theme could be the confusion between lust and love. People often mistake their strong physical desires for love at the beginning.
Growth could be another theme. As the characters experience love, they also grow as individuals. Their perspectives change and they learn more about themselves and what they want in life, all intertwined with the love story.
The main themes could include the exploration of different types of love. There could be passionate love which is like a high temperature, and then a more platonic or friendly love which is like a milder temperature. Another theme might be about the importance of communication in maintaining the right 'temperature' of love. If characters communicate well, they can keep their love at a comfortable 'temperature', but if not, it can lead to a drop or an overheating of the relationship.
One main theme could be courage. Since it's about 'daring' to love, the characters must find the courage to face their emotions, whether it's fear of rejection or fear of the unknown. Another theme might be self - discovery. Through the process of daring to love, the characters often learn more about themselves, their desires and what they are truly capable of.
One main theme could be the struggle between love and pain. Since it's 'Love in Sadness', there is likely a constant battle within the characters as they try to hold on to their love while dealing with the sadness.
One possible theme is the conflict between love and self - interest. The character's choice of 'darkness' over love might suggest that they prioritize their own needs or desires above the relationship.
As I'm not aware of this particular teleserye story, I'm unable to name the main characters. You might want to refer to official sources or fans of the show.