Although the ending of Boyfriend means that the male protagonist has not established a relationship with any female characters, so it is not a particularly good ending, but if you are interested in unlocking it, you can also try it.
In the plot of Chapter 6, three girls will force the player to make a choice and choose "I don't know" .
Continue the story. When you arrive at the cafe, there will be a story about giving flowers. Select " I will give this to my mom on her birthday ".
When chatting with brother Lao Liu, choose "Actually Not That Happy" (choosing other options will result in a lonely ending).
Finally, you will meet five heroines in the hotel. Do not make any choices when talking to them.
Next, watch the beach party animation, and upon completion, you can reach the "Best Friend" ending. When women get together, stay quiet and be a bystander.