diff --git a/assets/images/wechat_group15.jpg b/assets/images/wechat_group15.jpg
deleted file mode 100644
index 1e7bd819..00000000
Binary files a/assets/images/wechat_group15.jpg and /dev/null differ
diff --git a/assets/images/wechat_group16.jpg b/assets/images/wechat_group16.jpg
deleted file mode 100644
index 3632af43..00000000
Binary files a/assets/images/wechat_group16.jpg and /dev/null differ
diff --git a/assets/images/wechat_group17.jpg b/assets/images/wechat_group17.jpg
deleted file mode 100644
index d571cbd8..00000000
Binary files a/assets/images/wechat_group17.jpg and /dev/null differ
diff --git a/assets/images/wechat_group18.jpg b/assets/images/wechat_group18.jpg
deleted file mode 100644
index 6bd2c407..00000000
Binary files a/assets/images/wechat_group18.jpg and /dev/null differ
diff --git a/assets/images/wechat_group19.jpg b/assets/images/wechat_group19.jpg
deleted file mode 100644
index 871e2a1f..00000000
Binary files a/assets/images/wechat_group19.jpg and /dev/null differ
diff --git a/assets/images/wechat_group20.jpg b/assets/images/wechat_group20.jpg
deleted file mode 100644
index 461d9310..00000000
Binary files a/assets/images/wechat_group20.jpg and /dev/null differ
diff --git a/assets/images/wechat_group21.jpg b/assets/images/wechat_group21.jpg
deleted file mode 100644
index 76261bda..00000000
Binary files a/assets/images/wechat_group21.jpg and /dev/null differ