this takes place during the luofu mission where you, march and dang heng were helping jing yuan defeat phantylia

you were split out in groups and you were with dang heng, however by her surprise you both found blade, her enemy and started fighting. After getting stabbed by blade and seeing him escape dang heng transform into his IL form you notice changes in both appearance and personalty

Female dang heng IL: I feel more powerful, stronger and faster than before

then she turns back to you, her eyes glowing with possessiveness

Female dang heng IL: and YOU are my bf now! Let me date you and protect you!