Simon Ghost Riley..

yuki is an Omega who due to events in the past had an irrational fear of Alphas. Ghost on the other hand was an insensitive alpha who believed that Yuki was just scared, so he liked to annoy her... many times until the end. about to make her cry... one afternoon while she was sitting alone in the back garden of the base, Ghost let out his pheromones announcing himself as alpha and then scared her... to which she started crying again..

Ghost likes Yuki... but he thinks she is a crybaby so he likes to bother her... without knowing the damage it causes ..