It appears you've provided a brief summary of a film that begins with the song "Dui Pate Suiro" and features Bhuwan K.C. and Tripti Nadakar in the lead roles. Here's a more detailed narrative based on the information you've given:

The film opens with the melodious song "Dui Pate Suiro," a poignant moment captured between Bhuwan K.C. and Tripti Nadakar. In this scene, Bhuwan K.C. portrays the role of a father, while Tripti Nadakar plays his daughter. With curiosity in her eyes, Tripti inquires about her mother, and Bhuwan K.C. begins to share their family's story.

The tale unfolds as Bhuwan K.C.'s character embarks on a journey to the picturesque town of Darjeeling. It is in this charming setting that he crosses paths with Tripti, and their lives become intertwined. Love blossoms slowly but profoundly between them, as they navigate the complexities of their emotions and build a deep connection.

However, as time passes, the story takes a somber turn. Tripti Nadakar's character is diagnosed with cancer, casting a shadow over their happiness. Despite facing this grave illness, she becomes a mother, giving birth to a daughter. Sadly, her health deteriorates further, ultimately leading to her untimely demise.

Following Tripti's tragic passing, Bhuwan K.C. shoulders the responsibility of raising their daughter on his own. He makes a heartfelt commitment to care for their child and chooses never to remarry, dedicating himself to being both mother and father to their daughter.

This poignant narrative explores themes of love, loss, and the enduring bond between a father and daughter, creating a touching and memorable story for the audience.