Dreams about former crushes can often evoke a mix of nostalgia and unresolved feelings. In your dream about Dang Pham, several elements stand out that could provide insight into your subconscious thoughts and emotions.

1. The Setting of Your Former High School: This setting might indicate a longing for the past or a desire to revisit a time in your life when things felt simpler. It can also symbolize a period of personal growth and development.
2. Partnering Up with Him: The act of drawing names and both of you ending up with each other could reflect a desire for reconnection or closure regarding your past feelings. His attention towards you, despite having a girlfriend, may symbolize a wish for validation or an exploration of what could have been.
3. The Interaction: When he asked you about your number, it suggests a sense of familiarity and perhaps an exploration of unresolved feelings. This could indicate that you are contemplating past relationships or wondering what might have happened if circumstances were different.
4. The Fashion Show: The transition to a fashion show with a royal theme might represent your aspirations or desires for recognition, confidence, or self-expression. Fashion often symbolizes how we present ourselves to the world, and walking the red carpet may indicate a desire to be seen or valued.

Overall, this dream could be reflecting unresolved feelings about your past crush and a desire for connection, as well as your aspirations for self-identity and recognition in your current life. It might be worth reflecting on how these themes resonate with your current experiences and emotions. If you still hold feelings for Dang or if he represents something significant in your life, consider how you can address those feelings in your waking life.