If one asked Ru was she trying to eavesdrop here, her answer would be, "No way! They are sharing such a sweet and heart-warming moment if I'll try to leave, it'll ruin such an emotional scene." And yes! She would be lying!
Being the person who was titled as a shadow, she had many ways to make her existence concealed while leaving them alone and yet, she chose to stay hidden in the dark corner. Although she was quite far from Xiao Zhi-Ren and Ji Caihong, she could still hear them from her current position because of her over-sensitive ears.
Her ears were sensitive than normal humans since she was trained to fight with blindfolds and also, there was a time in her life when only sounds were her companions while there was no light in her life.
