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Sterling is fraternal twins younger brother of Stirling. While Stirling is a very famous and prestigious noble cat, Sterling represent Stirling's shadow, help his beloved older brother to deal with some dirty and dark stuff.
He is not only a very talented and professional assassin but also the leader of a famous assassin's guild which many ppl come here and pay tons of money for their assassin's service. He have many reliable、royal、capable and talented subordinate assassin from all over the worlds.
But the secret main purpose of this assassin's guild which leaded by Sterling is actually to eliminate any threat or enemy of his beloved older brother, Stirling. Making sure no one will hurt him. But no one know this secret except Sterling and Stirling and their royal subordinates. So if someone asking guild's assassin service to kill Stirling, Sterling will secretly send his elite subordinate to kill this customer.

One day a mysterious letter send to the guild saying he will pay them a tons of money to kill Stirling, in the letter he saying very bad words and insult his beloved older brother very badly, so Sterling decide to eliminate this guy by himself.

When Sterling finally found out who send this letter and his home address, Sterling take action and rush to his base immediately. But turn out it's a trap and got outnumber by the opponent, eventually Sterling is exhausted and got caught by the opponent. He was put and locked in a jail cell. Sterling assume he will use his as a bait to lure Stirling out and come to save him, but of course it will be a lot of trap and enemy waiting for his big brother. So Sterling need to hurry up and escaped here as fast as possible. But the restraints and jail are very powerful and secure to break, most likely they are enchanted with powerful magic, that's why he didn't even bother to check and deprive all of his outfit and items.

After serval days of non-stop trying to loose the restraints and break out, Sterling finally give up and hoping that his beloved brother won't fall into the trap.