diff --git a/lua/leetcode-plugins/cn/normalizer.lua b/lua/leetcode-plugins/cn/normalizer.lua
index 9881a22a..5f66d323 100644
--- a/lua/leetcode-plugins/cn/normalizer.lua
+++ b/lua/leetcode-plugins/cn/normalizer.lua
@@ -9,6 +9,7 @@ function Normalizer:cleanup()
         :gsub("<br%s*/>", "\n")
         :gsub("<meta[^>]*/>", "")
         :gsub("&nbsp;", " ")
+        :gsub("<([^/%a!])", "&lt;%1")
         :gsub("<(/?)b>", "<%1strong>")
         :gsub(":", "：")
 end
diff --git a/lua/leetcode/parser/normalizer.lua b/lua/leetcode/parser/normalizer.lua
index e3c24ca1..7e2783c1 100644
--- a/lua/leetcode/parser/normalizer.lua
+++ b/lua/leetcode/parser/normalizer.lua
@@ -14,6 +14,7 @@ function Normalizer:cleanup() --
         :gsub("<br%s*/>", "\n")
         :gsub("<meta[^>]*/>", "")
         :gsub("&nbsp;", " ")
+        :gsub("<([^/%a!])", "&lt;%1")
         -- :gsub("<(/?)b([^>]*)>", "<%1strong%2>")
         :gsub("<(/?)b>", "<%1strong>")
     -- :gsub("&#?%w+;", function(e) --