Well, without more details about 'The First Commandment BL Novel', it's a bit hard to give exact similar ones. However, 'Yuri!!! on Ice' (although it's more of an anime with strong BL undertones) inspired a lot of BL - like fanfiction. Also, 'No. 6' is a great dystopian BL - ish story that might be of interest if you like complex world - building and relationships.
As I'm not familiar with this particular novel, it's difficult to say. However, common themes in BL novels can also include social issues such as homophobia and how the characters navigate through a society that may not be fully accepting. Maybe 'The First Commandment BL Novel' also touches on the power dynamics in relationships, as some BL novels do.
One similar BL novel could be 'Love by Chance'. It also has a complex relationship web among the characters and explores themes of young love and self - discovery.
One similar BL novel could be 'Love is an Open Door' in the BL genre. It has a cute and innocent love story between the main characters.
One could be 'Addicted: Heroin'. It has complex characters and an engaging plot that might appeal to fans of 'winner is king bl novel'.
Well, 'History3: Trapped' is somewhat similar. It has a strong plotline and engaging characters in a BL relationship. 'Make It Right' is also in the same vein. It shows the development of love between boys in a rather realistic way. 'Love By Top Chance' is another BL novel that might interest you as it has elements that are comparable to 'love by chance the series bl novel'.
One similar BL novel could be 'Given'. It has a deep emotional connection between the main characters, much like how the red thread might symbolize a fated connection in 'the red thread bl novel'.
One could be 'Given'. It has a beautiful story of love and self - discovery among boys. Another is 'Sasaki and Miyano' which shows a cute and heartwarming relationship. There's also 'No. 6' which has an interesting post - apocalyptic setting and a strong relationship between the two male leads.
Sure. '2gether: The Series' is a great one. It has a cute story of two boys gradually falling in love. Another is 'SOTUS: The Series' which focuses on the relationship between a senior and a freshman in a university setting. And 'TharnType: The Series' also has an interesting plot about two very different guys coming together.
There's also 'Mo Dao Zu Shi'. It tells a story of love and redemption. The relationship between the main characters is very touching, and the world - building in the novel is quite detailed, making it a great read for those who like Chinese BL novels.
One similar BL novel could be 'Given'. It has a great story about music and the relationship between the main characters that develops in a very heartwarming way.