旧雨馨栀
[jiù yŭ xīn zhī]
'Xin Zhi' refers to a kind of flower with a beautiful smell in summer; so combining this element, 'old rain perfuming the flower' conveys meanings related to sweet nostalgia and memory (as when it rains over an old acquaintance or location) and warm emotions during rainy times in summers filled with blooming flowers.