Social Beast Brothers Turn into Girls, Friendship Deteriorates

[Running in both directions/surname change/pure love/change of marriage] Shen Zixuan, a computer science expert, rushed to a scientific research project late at night and accidentally triggered a gender change, transforming from a rough guy into a comely girl. The only person he can turn to is Jiang Chi, his best friend of three years. Moving in together, wearing his sister's clothes to work together, watching him complain about "how can you work on projects in this state" while staying up late to help him; silently handing him brown sugar and ginger tea during menstruation, saying with a blush that he "looked it up online"; when being approached by the opposite sex, subconsciously protecting him behind him, saying "I'm just afraid you won't adapt", but his eyes can't hide the nervousness. Jiang Chi always classified his special care for Shen Zixuan as "worrying about his brother", until one night when he was working on a project late at night, he stared at the other person's side face wearing black-rimmed glasses and typing code seriously, and suddenly his heartbeat was out of order - it turned out that the stuckness when complaining and the panic when looking at each other were never "brotherly love". Shen Zixuan clutched the old USB flash drive he gave (which contained a photo of the two of them), and finally expressed his feelings that he had been unable to hide for a long time: "Jiang Chi, I should have... Fallen in love with you."