For a time after the Calamity, Kylin mostly buried himself in work. The young man would in time take over numerous excavation projects and exhibit projects for the Avalon Heritage Museum after Cartius reobtained that old asset from the destroyed House Mavanix. He would also move into the new Felstar Manor in Ul'dah. Elza remained his confidant for awhile before Kylin starting seeing a professional counselor to deal with the still lingering emotional trauma of losing Gerik, Seraphine, and dealing with the destruction of House Mavanix at Cartius's hands.
At some point, Elza set Kylin up with a blind date that turned into a serious relationship. The relationship would turn sour over time, when Kylin's paranoia, jealousy, and manipulations caused it to self-destruct. Depression seized the young man again for a brief time before he began to place all of his attention strictly into work related matters for House Felstar.
Kylin has also spent a significant portion of his down time conducting heavy physical training, while still attempting to keep up with his magical training when he could fit it in. As a result from his extensive training with Vertigo (the family head of security), his physical build increased noticeably and his skill with swords and daggers also become significantly better.
Upon a chance reunion with Gerik during an excavation, Kylin began to slowly become obsessed with his former flame as the fond memories of a better life resurfaced. This obsession began to lead to horrible acts by Kylin as he manipulated and schemed to win Gerik back from his new lover, Burgenheim. He first hired Rhio Aldul to be a fake girlfriend of his during a staged double-date with Gerik and Burgenheim. Things continued to spiral out of control when Kylin hired Rhio again, along with pirate captain, Tyriont Gaidal, to fake mug Aysun Demiir while Kylin fake rescued her. The plan was to win over Aysun, one of Gerik's friends, so that she'd help get Gerik back for Kylin. The plan backfired though as Aysun began to unravel the plot.
Following this, Kylin masterminded a fake cruise with the help of pirate captain, Tyriont Gaidal. Tyriont would, however, go back on the plan at the last minute and become a cheerleader for Gerik and Burgenheim. This resulted in a near death experience for Burgenheim on the fake cruise when Kylin secretly caused the ship to rock violently when Burgenheim was close to the side of the ship.
Still determined more than ever to win over the presumed love of his life, Kylin continued to plot and scheme by targeting K'aworu Demiir in an attempt to blackmail Aysun and Fenix Darkblaze into getting Gerik back for him. Kylin seduced K'aworu and used their new budding relationship as a weapon to get what he wanted. The plan ultimately failed, and even resulted in a deadly battle between Kylin and the Poet (Razeiel Venaire) that resulted in some moderate damage to the Lost Hope village in Thanalan.
As multiple lives continued to get caught in Kylin's obsession-based crossfire, Aysun and Fenix finally persuaded Gerik to confront Kylin and renounce any chance of them being together. This caused Kylin to finally snap and he used his summoning abilities to attempt to slay Fenix and Aysun. Rhio, also being present, took part in the battle outside Ul'dah as well. The end result was Kylin ending up in a coma from both the explosion from his own egi, along with the intense aether poisoning he endured from his long-standing medical condition. Kylin would disappear for a time after that, receiving both physical and emotional therapy.