Scent Spark

When defective omega and skilled mercenary Erad Nox is hired to find a runaway alpha mage and bring him back to the Tower of Mages, he thinks it'll be the easiest job he's ever done in his life. Little did he expect that upon meeting Lucian, the mage in question, he'd suddenly enter his heat cycle - something that hasn't happened in the past 11 years. Intrigued by this strange phenomenon, Lucian asks him to stay and become his research subject. As they spend time together, Nox finds himself drawn to Lucian's compassion and bashful kindness, while Lucian begins to fall in love with Nox's fearless strength and integrity.

(Source: Lezhin US)

Note: Includes seven extra chapters.