旧了光年失去时间忘记少年淡了光阴忘记呼吸弹指挥间
[jiù le guāng nián shī qù shí jiān wàng jì shăo nián dàn le guāng yīn wàng jì hū xī dàn zhĭ huī jiān]
This nickname paints a poignant picture of lost time and youth - it translates to 'In an instant of time gone by, losing track of years and even breaths'. It signifies regret or contemplation regarding past events that happened in fleeting moments and left indelible impacts.